Determination Of Trace Amounts Research Articles

A solid-phase fluorescent, quenching method for the determination of trace amounts of nitrite in foods with neutral red

A simple and sensitive solid-phase fluorescent quenching method for the determination of trace amounts of nitrite in food samples has been developed. The method is based on the reaction between nitrite and neutral red, which is used as an emission reagent, to form a non-fluorescent compound in 0.1 mol/L hydrochloric acid. The fluorescent intensity was measured in 5-mm quartz cells with excitation and emission wavelengths of 548 and 609 nm, respectively. The degree of fluorescent quenching showed good linearity at concentrations of nitrite between the ranges of 40-200 μg/L. The detection limit is 8.1 μg/L and the RSD is 1.7%. The general coexisting ions do not interfere with the reaction of neutral red with nitrite. The proposed method was applied to the determination of trace amounts of nitrite in food samples with satisfactory results. In addition, the mechanism involved in the reaction was discussed.

Rapid determination of trace potassium in drinks and serum by Rayleigh light scattering technique

In this paper, a sensitive, rapid and selective method based on Rayleigh light scattering technique (RLS) was proposed for the determination of potassium using a conventional spectrofluorometer. Potassium was transformed to KB(C6H5)4 particles, which displayed intense light scattering in aqueous solutions. Effects of factors such as wavelength, acidity, ionic strength and coexistent interferents on the RLS of B(C6H5)4-K were investigated. The RLS intensity of the KB(C6H5)4 suspension was obtained in NaAc solution (0.50 M, pH = 8.0) and the addition of 0.5 mL of sodium dodecyl benzene sulfonate (5.05 μM) and 1.0 mL of tetraphenylborion sodium (1.0%). The Rayleigh scattering light intensity at the maximum peak of 567 nm was proportional to the concentration of potassium ion in the range of 0.20-1.60 μg mL-1 with a detection limit of 0.10 μg mL-1. To determine the feasibility of the proposed method, samples of water, drinks and serum were analyzed. The attained results were in agreement with the ion-selective electrode method. Good recovery was also obtained in a range of 95.10-107.02%. The sensitivity and selectivity of the RLS method are high enough to determine trace amounts of potassium ion without any significant interference from high levels of other components such as common anions and cations.

A novel catalytic adsorptive stripping voltammetric method for the determination of germanium ultratraces in the presence of chloranilic acid and the V(IV)\xb7HEDTA complex

A novel, sensitive catalytic adsorptive stripping voltammetric procedure which can be used to determine trace amounts of germanium is described. The method is based on the interfacial accumulation of the complex formed by Ge(IV) and the product of the reduction of chloranilic acid on the hanging mercury drop electrode or the renewable silver amalgam film electrode, and its subsequent reduction from the adsorbed state followed by the catalytic action of the V(IV)·HEDTA complex. The presence of V(IV)·HEDTA greatly enhances the adsorptive stripping response of Ge. The reduction of the Ge(IV) in the presence of chloranilic acid and V(IV)·HEDTA was investigated in detail and the effects of pH, electrolyte composition, and instrumental parameters were studied. Under optimal conditions, the catalytic peak current of germanium exhibited good linearity for Ge(IV) concentrations in the range of 0.75–60 nM (for 60 s of accumulation at −0.1 V, r2 = 0.995) and a low limit of detection (LOD = 0.085 nM). The procedure was successfully applied to determine Ge in water samples.

A microextraction method based on precipitation for the simultaneous separation and preconcentration of cadmium and lead before their determination by FAAS: experimental design methodology

ABSTRACT A simple and rapid separation and preconcentration method based on precipitation combined with flame atomic absorption spectrometry for the determination of trace amounts of cadmium and lead ions has been introduced. Under the optimum conditions, the method exhibited linear dynamic ranges of 5–400 µg/L for cadmium and 8–500 µg/L for lead. The detection limits were 0.96 and 1.71 µg/L and the enhancement factors were 115 and 110 for cadmium and lead, respectively. The results revealed that the presented method is a good technique for the determination of target metal ions in natural water samples.

Rapid determination of mefenamic acid by ion mobility spectrometry after ultrasound-assisted extraction by HKUST-1 metal-organic framework: a simple strategy for food safety control

Mefenamic acid (MFA), (2- [2, 3-dimethylphenyl amino] benzoic acid) is an acidic nonsteroidal anti-inflammatory drug (NSAID) that is widely used in veterinary medicine. Because of entering residue of mefenamic acid in drinking water, food products and indeed in the food chains, the potential risk on customer’s health increases. Therefore, the development of test methods for monitoring of this drug in animal tissue and food samples is needed. In this study, a combination of ultrasound metal-organic framework dispersive solid-phase extraction with ion mobility spectrometry was used for selective, sensitive and rapid determination of MFA residues in food samples. HKUST-1 (copper (II) benzene- 1, 3, 5- tricarboxylate) metal-organic framework (MOF) was synthesized in a green route and used as solid phase for extraction of MFA residues of real samples. Effective parameters such as extraction time, amount of sorbent, pH and were optimized to achieve the best extraction process. The Effect of ultrasonic waves on the desorption step in extraction was studied and results show using ultrasound waves causes an increase in extraction recovery from 68 to 97%. Under optimum conditions, the method exhibits the linear range of 2.0–150.0 μg L−1 (R2 = 0.9989) with a detection limit of 0.4 μg L−1 and a low relative standard deviation (˂ 5%). The proposed method was applied for the extraction and determination of trace amounts of MFA in real samples such as drinking water, milk, baby food, and body supplement powder.

Malathion determination in Rice samples with Graphene oxide reinforced hollow fiber-solid phase microextraction by GC-MASS

A method for applicability of the solid phase microextraction (SPME) procedure for determination of trace amounts of the organophosphorus pesticide malathion by gas chromatography - mass spectrometry (GC-MS) was developed. Graphene oxide reinforced sol–gel which was placed in hollow fiber (HF-SPME) was used for pre-concentration of malathion. In the present study the Plackett-Burman (PB) factorial design was used as a method for first monitoring of Eight factors that have a significant impact and optimized them in next stage, optimization process of significant factor was carried out using a five-level CCD after screening by PBD. the following conditions were selected for the analytical method of Malathion in real sample: amount of GO (0.01gr), pH of aqueous solution (pH: 3), volume of aqueous solution (10000 µl), volume of organic solvent (250 µl), adsorption time (35 min), desorption time (30 min), stirring rate of solution (1000 rpm) and amount of salt (4%). Calibration curves were plotted using three spiking levels of malathion in the concentration ranges of 0.2–0.4-0.5 ng/mL with correlation coefficients (r 2 ) 0.9914 for analytes. Under the optimized extraction conditions, the method showed good linearity (0.05–0.5 ng/mL), repeatability, low limits of detections (3.9×10 -3 ng/mL) and excellent pre-concentration factors (4000). The optimum conditions which were evaluated then applied for the analysis of malathion in the rice as a real sample

Азозамещенные этоксиакридина – реагент для экстракционно-фотометрического определения индия(III)

The associates of bromo-indate with azo-substituted ethoxyacridine have been studied by spectrophoto-metric method. It has been found that the associates are well extracted with a mixture of chloroform acetone (4:1). The optimum volume of aqueous and organic phase is equal to 5 ml. The molar ratio of the components in the extractable compounds was studied by the methods of isomolar series, equilibrium shift and a straight line. It was found that bromo-indate associated with azo-ethoxyacridines (AE) in a ratio of 1:1. Study of the effect of foreign ions on the accuracy of the determination of indium with azo-substituted ethoxyacridine showed that the number of ions does not interfere (in parentheses are multiple relationships to indium ions); CdII (1200), NH4+ (4000), Zn2+ (1500), CoII (1100), NiII (1050), CuII (500), FeII (4000), PbII (250), Nb (250), TaV (270), Al3+ (2000), ReVII (140), B3+ (410), C2O42- (1900), CH3COO- (1300), ascorbic acid (270), citrate ion (3500), tartrates (4000), EDTA (3700). Number of ions interfered the determination: TlIII (1), FeIII (1), Ga3+ (1), HgII (1), SbV (1), AuIII (1), thiourea (4). It was studied formation and extraction of associates of bromo-indate with AEADPA (2-ethoxy-6-(4-N,N-dipropylphenylazo)-9-aminoacridine) and AEADEA (2-ethoxy-6-(N,N-ethylphenylazo)-9-aminoacridine). The maxima of light absorption of bromo-indate with AEADPA is observed at 530 nm, and the AEADEA at 515 nm. The physico-chemical and analytical characteristics of the azo-substituted ethoxyacridines and their ionic associates with indium bromide acid complexes (λmax ε, βkD, D, R%) were determined. It was shown that bromo-indate compounds with azo-substituted ethoxyacridines are ionic associates, the molar ratios of the components in which are: [İn III] : [Br -] : R + = 1:4:1. Highly efficient extraction-photometric methods have been developed for the determination of trace amounts of indium in various objects.

Simultaneous determination of sulfonamides in milk: In-situ magnetic ionic liquid dispersive liquid-liquid microextraction coupled with HPLC.

Four novel organic magnetic ionic liquids were synthesized and characterized. A new method of in-situ magnetic ionic liquid dispersive liquid-liquid microextraction coupled with HPLC was established to simultaneously separate, preconcentrate and determine trace amount of sulfonamides in milk samples for the first time. In this work, extraction procedure was free of volatile organic solvent. Extraction equilibrium was immediately achieved without further operation such as vortex shaking. Magnetic separation of two phases was effectively achieved by applying external magnetic field without need of centrifugation. Furthermore, only a very small amount of inorganic salts were generated. This is the first time to realize all these advantages in an analytical method. Under the optimal conditions, satisfactory enrichment factors, precisions, linear range and low limit of detection and quantitation were acquired. The validated method was successfully applied in the simultaneous analysis of 5 sulfonamides in real milk samples.

A Sheep Model for the Osseointegration of PEO-treated Gamma Titanium Aluminide

A sheep model was used to study the osseointegration of gamma titanium aluminide (γTiAl) screws subjected to plasma electrolytic oxidation (PEO). The degree of osseointegration was determined by measuring the maximum torque for screw removal from bone after 3 and 6 months of implant placement in sheep for PEO-treated γTiAl, untreated γTiAl, and untreated Ti6Al4V cortical screws. The amount of bone growth and mineralization were qualitatively observed by von Kossa staining of the bone tissue in the region surrounding the implants. Inductive Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) was carried out to determine trace amounts of metallic elements in blood serum samples obtained from the animals. Generally Al, Cr and V were present in blood serum in comparable quantities in the control and implanted animals, while neither Ti nor Nb was detected. Results from histological analysis and SEM images indicated that de novo bone growth occurred to a greater extent for the PEO treated γTiAl screws. Furthermore, the torque for screw removal from bone was significantly higher (p<0.05) for the PEO-treated γTiAl implants. Taken together, the data supports that the PEO surface treatment enhanced osseointegration to a considerable degree indicating the potential for favorably utilizing PEO-treated γTiAl for dental and orthopedic implant applications.

Determination of Trace Amounts of Platinum Group Elements and Gold in Ultrabasic Rocks by Inductively Coupled Plasma Mass Spectrometry Using AG-X8 and LN-Resin Sorbents

A procedure is developed for determining trace amounts of Pt, Pd, Rh, Ru, Ir, and Au in ultrabasic rocks by inductively coupled plasma mass spectrometry. Chemical sample preparation included acid decomposition, separation of the main matrix components on an AG-X8 cation exchanger, and the subsequent separation of Zr, Hf, and Ta on an LN-Rezin complexing adsorbent. The limits of detection for Ru, Pd, Ir, Pt, Rh, and Au were 0.06, 0.2, 0.003, 0.4, 0.1, and 0.2 ng/g, respectively; the relative standard deviation in the determination of elements in the samples varies from 8 to 20% for Au, 2 to 9% for Pd, from 1 to 6% for Pt, from 1 to 4% for Ir, from 1 to 18% for Rh, and from 3 to 7% for Ru. The accuracy of the results is confirmed by their comparison with the published data for samples of HARZ01 harzburgite and OPY-1 ultrabasic rock, obtained in the framework of the international GeoPT program.

Vertically grown nanosheets conductive polypyrrole as a sorbent for nanomolar detection of salicylic acid

A selective detection strategy for salicylic acid (SA) based on the electrosorption/electrodesorption process using an electrochemically controlled solid phase extraction (EC-SPME) configuration is presented. We used conducting polymer polypyrrole (PPy) bearing the anionic dopant nitrate (PPy/nitrate) as a sorbent element for the extraction of SA in plasma and urine samples. The vertically grown nanosheets conducting film was directly synthesized by cyclic voltammetry method on a rod-shaped stainless steel electrode. The prepared electrode was employed for selective electrosorption of SA from sample solutions by applying positive potential and following its successive electrodesorption by the use of negative potential. Several parameters like synthesis conditions, anion dopant effect, potential and time of electrosorption/electrodesorption, and exchange anion type were explored to achieve the optimal conditions. The morphology of nanostructure PPy/nitrate sorbent was characterized by scanning electron microscopy (SEM). The electrosorption of SA was demonstrated by using FT-IR and fluorescence microscopic imaging. The obtained linear dynamic range (LDR), the limit of detection (LOD), and RSD% of SA determination by fluorescence spectrometry were 5–100 nanomol L−1, 1.4 nanomol L−1 and 4.9 (n = 5), respectively. The suggested technique was successfully applied for the quantification and determination of trace amounts of SA in biomedical samples without any additional treatment.

Spectrophotometric Determination of Trace Amounts of Benzotriazole in Aqueous Solutions Using Gold Nanoparticles: Artificial Neural Network Modeling

AbstractIn this study, ultraviolet–visible (UV–Vis) spectrophotometry method was applied to determine benzotriazole (BTA) in aqueous solutions based on surface plasmon resonance (SPR) property of gold nanoparticles (AuNPs). The experimental variables such as pH, time, the volume of various buffers, the concentration of different electrolytes, and concentrations of AuNPs were investigated. Under optimum conditions, the proposed method represented a linear range between 10 to 150 μg L−1 (R2= 0.9941) with a detection limit (LOD) of 5 μg L−1. This method was successfully used to measure trace amounts of BTA in Ahwaz drinking water and Ramin power plant cooling water samples. The proposed spectrophotometry assay is accurate, low‐cost, simple, and does not need any separation steps compared to the other methods. In the next step, an artificial neural network (ANN) using Levenberg‐Marquardt (LM) and Resilient Back propagation (RP) algorithms, was used to predict the absorbance of the mentioned factors. For each algorithm, 2 layers and for each layer 2,4,6,8, and 10 neurons were studied. According to mean square error (MSE) and coefficient of determination (R2), the LM algorithm was better than the RP algorithm for the prediction of absorbance.

Study and reduction of matrix effects in flowing liquid anode - Atmospheric pressure glow discharge - Optical emission spectrometry

The effect of different interfering elements, i.e., Na, K, Mg, Ca, Al, Cu, Fe, Mn, Ni, and Zn, on the analytical performance of flowing liquid anode atmospheric pressure glow discharge optical emission spectrometry (FLA-APGD OES) was extensively studied. In the presence of interfering ions, the emission from analytes was suppressed by ∼10% in the case of Hg and Tl, ∼20% for Cd and Ag, and up to ∼80% for Zn and Pb. This study revealed that interfering elements did not affect the atomization/excitation conditions, and the reason for the observed decrease in analytical response was the impaired efficiency of analytes transport from liquid to plasma phase. To reduce matrix effects, the use of different masking agents capable of complexing the interfering ions, e.g., organic acids, crown ethers, chelating agents, and other compounds, was investigated. FLA-APGD appeared to be quite susceptible to the presence of masking agents and only their small amounts could be added (limiting the effectiveness of this approach). Despite this, it was possible to significantly reduce the matrix effects originating from transition metals and alkali/alkaline earth metals. Based on the results presented herein, different sample treatment procedures, aimed at the minimization of matrix effects in microplasma excitation sources, can be developed. As an example, a method for the determination of trace amounts of Zn and Pb in the Fe-rich matrix has been shown. By the use of the selected masking agents, the recovery of Zn and Pb was improved 5.6-fold (from 10.4 to 57.8%) and 2.8-fold (from 13.6 to 38.0%), respectively. Despite the presence of Fe-rich matrix, the detection limits of Zn and Pb were quite low (0.1 and 0.8 μg L−1, respectively) and they were apparently lower than offered by ICP OES.

Application of zirconium-based metal–organic frameworks for micro-extraction by packed sorbent of urinary trans, trans-muconic acid

In this study, we report for the first time developing an analytical method based on three metal–organic frameworks (MOF) including UiO-66, UiO-66-NH2 and UiO-66-NH2 @ Fe3O4-SiO2 in micro-extraction by packed sorbent (MEPS) extracting trans, trans-muconic acid (tt-MA) in urine. The FT-IR, XRD and FE-SEM techniques were used for characterization of the synthesized MOFs. The effects of some analytical parameters were investigated on the MEPS performance using central composite design by response surface methodology. The findings demonstrated that the sample volume and desorption cycles were the most important parameters for the extraction of tt-MA using UiO-MEPS procedure combined with high-performance liquid chromatography (HPLC). The limit of quantification (LOQ) of UiO-MEPS-HPLC procedure for UiO-66, UiO-66-NH2 and UiO-66-NH2 @ Fe3O4-SiO2 core–shell was 0.005, 0.005 and 0.003 µg mL−1, respectively. Under optimal conditions, the UiO-MEPS-HPLC method offered a good performance for extracting tt-MA from urine samples (UiO-66, UiO-66-NH2 and UiO-66-NH2 @ Fe3O4-SiO2 core–shell: 86%, 0.95% and 98.5%, respectively, RSD < 3.54%). The results indicated that this technique was a sensitive, fast and reusable method and can be applied to extract and determine trace amounts of urinary tt-MA in the urine matrix.

Trace analysis of Pb(II) in milk samples by Fe 3 O 4 @SiO 2 @3‐chloropropyltriethoxysilane@o‐phenylendiamine nanoparticles as an unprecedented adsorbent for magnetic dispersive solid phase extraction

In the present work, a magnetic dispersive solid-phase extraction method followed by flame atomic absorption spectrometry was used for extraction, preconcentration and determination of trace amounts of Pb(II) in milk samples. Fe3O4@SiO2@3-chloropropyltriethoxysilane@o-phenylendiamine nanoparticles were synthesised and used as the adsorbent in the extraction procedure. The effective parameters of the extraction efficiency comprising pH of the sample solution, sorbent amount, extraction time, acidic concentration of the eluent and desorption time were optimised using a face-centred central composite design. Under the optimal conditions, the applied method offered suitable linearity in the range of 2.0–250 ng mL−1, the limit of detection as low as 0.11 ng mL−1, and high preconcentration factor of 66. The precision of the proposed method was evaluated by calculating the intra-day and inter-day relative standard deviation, which were <3.4 and 5.5%, respectively. The applicability of the method in real sample analysis was tested by analysing bovine milk samples. The relative recoveries in the range of 81.6–97.2% showed the suggested method is of appropriate accuracy in real sample analysis.

A Novel Online Hydride Generation Technique for the Simultaneous Determination of Ultra Trace Amounts of Hydride Forming Elements in Water Samples by Inductively Coupled Plasma Optical Emission Spectrometry

A simple and rapid online hydride generation technique based on ultrasonic nebulizer was applied for the first time for the simultaneous determination of trace amounts of As, Bi, Sb, Se and Te by inductively coupled plasma optical emission spectrometry. In this method, we used an ultrasonic nebulizer as a hydride generator and sample introducer simultaneously. An ultrasonic nebulizer was applied for the online hydride generation technique without using any device, such as a gas phase separator, which is mandatory in the classic hydride generation method. This technique improved method detection limit comparing to the traditional hydride generation system which is a necessity in the ultra-trace determination of hydride forming elements. The developed technique shows an improvement factor ranging from 56 to 450 times in detection limits in comparison to a concentric nebulizer. The obtained detection limits were well below the maximum concentration limit. The practical applicability of the developed method was examined using natural water samples.

Method development for determination of trace amounts of palladium in environmental water samples by ICP-MS/MS after pre-concentration on thiol-functionalized MCM-41 materials

The anthropogenic cycle of Pd in the environment, its fate and impact is still unknown due to limitations of measurement techniques. For separation and pre-concentration of Pd(II) ions, mesoporous silica materials MCM-41 were synthesized and functionalized with different amounts of 3-mercaptopropyltrimethoxysilane (MPTMS) by co-condensation and grafting methods. The structural and textural properties of materials were characterized using XRD, TEM, SEM and BET techniques. The results proved that functionalization with thiol groups did not significantly affect structural and textural parameters of synthesized sorbents. The Pd(II) ions were quantitatively retained on sorbents functionalized by grafting in acidic solutions (pH 2), efficiently eluted with 0.1 mol L−1 thiourea solution in 1 mol L−1 HCl and determined by electrothermal atomic absorption spectrometry (ETAAS). The limit of detection (LOD) of the developed SPE ETAAS method was 0.06 ng mL−1, and the pre-concentration factor was 30. For analysis of Pd in environmental water samples inductively coupled plasma mass spectrometry (ICP-MS) in MS/MS mode was used. Spectral interferences on 105Pd caused by the presence of Sr in water samples were eliminated using helium (5 mL min−1) or ammonia (7 mL min−1) gas in collision/reaction cell. The developed SPE ICP-MS method is characterized by good selectivity in the presence of interfering elements and chloride ions and detection limit of 0.0002 ng mL−1. Its accuracy was confirmed by analysis of spiked water samples. The application of ICP-MS together with efficient separation/pre-concentration of analyte on thiol-functionalized MCM-41 sorbents allows to determine Pd in environmental water samples at pg mL−1 level.

Application of Fusarium sp. immobilized on multi-walled carbon nanotubes for solid-phase extraction and trace analysis of heavy metal cations

In the present work, for the first time, the filamentous fungus Fusarium sp. was utilized for devising a novel method for pre-concentration and determination of trace amounts of Pb(II), Cu(II), Cd(II), and Zn(II) ions, using a mini-column packed with Fusarium-coated multi-walled carbon nanotubes and inductively coupled plasma-optical emission spectrometry. Optimal analytical conditions including pH, ionic strength, elution solution, sample and eluent flow rates, and sample volume were determined. The detection limits were 0.39, 0.060, 0.021, and 0.025 ng mL−1 for Pb(II), Cu(II), Cd(II), and Zn(II) cations, respectively. This new method demonstrated a high performance for the analytes, and their adsorption was not affected by the different co-existing ions. The present procedure was validated by the analysis of standard reference materials, since the obtained data were in close agreement with reference values. Finally, this new procedure was successfully applied to analysis of heavy metal cations in natural food and water samples.

A NEW MIP EMBEDDED CRYOGEL FOR SELECTIVE PRE-CONCENTRATION AND REMOVAL OF PROPACHLOR

Propachlor is a pesticide commonly used in the chloroacetanilide herbicide group. Propachlor contamination occurs in groundwater resources and soil sources. Therefore removal and also the determination of trace amounts of propachlor is a very important issue. Molecularly imprinted polymers (MIPS) are preferred for their advantages such as high affinity, strength, and selectivity in pesticide removal and determination. In this study, MIP embedded cryogel was synthesized for selective adsorption and removal of propachlor. MIP synthesis was performed using the template molecule propachlor, functional monomer methacrylic acid, crosslinker ethylene glycol dimethacrylate (EDGMA), solvent hexadecane and 2,2-azo-bis-isobutyronitrile (AIBN) as the initiator. Cryogels are a good alternative for separation and purification because of their advantageous properties such as short diffusion, low pressure and adsorption and elution in a short time. The structure of MIP was determined using scanning electron microscopy (SEM), Elemental analyze and Fourier transform infrared spectroscopy (FT-IR), and the structure of MIP embedded cryogel was determined using scanning electron microscopy (SEM). The highest adsorption capacity for MIP was 5.58 mg g-1 at pH 5. The highest adsorption capacity for MIP embedded cryogel was found to be 14.38 mg g-1. MIP embedded cryogel were used for selective adsorption and desorption of propachlor in environmental samples. The concentration of propachlor in environmental samples was analyzed by high-performance liquid chromatography (HPLC).

Molybdenum disulfide-hypercrosslinked polymer composite as an adsorbent for determination of polycyclic aromatic hydrocarbons in environmental water coupled with HPLC-FLD.

A composite was synthesized from two-dimensional molybdenum disulfide (MoS2) nanosheets and hypercrosslinked polymers (HCP), and the composite was characterized by infrared spectroscopy, scanning electron microscopy, and specific surface area. The fluffy and porous structure and multiple adsorption sites (π-interaction, static electricity, hydrogen bonding) make it ideal for use as an adsorbent. A pipette tip solid-phase extraction with the composite as the adsorbent combined with HPLC-FLD was developed to determine trace amounts of polycyclic aromatic hydrocarbons (phenanthrene, anthracene, fluoranthene, pyrene, benzo(α)anthracene) in environmental water. Under optimal extraction conditions, the method has a wide linear range (0.5-100ngmL-1) and low limit of detection (0.024-0.099ngmL-1), and the recoveries of PAHs from spiked environmental water were 73.8% to 123.6% (relative standard deviation ≤ 6.7%, n= 3). Graphical abstract Schematic representation of a three-dimensional molybdenum disulfide-ethylenediamine-hypercrosslinked polymer composite (MoS2-EDA-HCP) using pipette tip solid-phase extraction adsorbent for extracting trace levels of polycyclic aromatic hydrocarbons (PAHs) prior to HPLC-FLD. HCP, hypercrosslinked polymer; MoS2, molybdenum disulfide; EDA, ethylenediamine.